1977 年 10 巻 1 号 p. 25-29
It has been made clear that the performance of muscular strength exertion is influenced by the respiratory phase at the moment of starting the exertion. The relation between control of breathing phases and timing of punching in Karate was experimentally studied. It was revealed that reaction time was the shortest and punching strength was the largest when the subject started his action around the end of the inspiratory phase and finished it before or at the beginning of the expiratory phase. When the punching was started around the beginning of the expiratory phase, the subject tended to produce a W-shaped respiratory curve yielding lag of timing of the moment. These results may be relevant of the problem of unguarded moment in fighting with each other.